Computer A (assumed that ip is 126.96.36.199)can ftp the host 188.8.131.52.
ftp 184.108.40.206 Connected to 220.127.116.11. 220 ftp.debian.org FTP server Name (18.104.22.168:debian8): anonymous 331 Please specify the password. Password: 230 Login successful. Remote system type is UNIX. Using binary mode to transfer files.
Computer B (my local pc) can not ftp the host 22.214.171.124. Let's build a ssh tunnel with ssh command this way:
ssh -L -f -N localhost:2121:126.96.36.199:21 email@example.com
The ssh tunnel between my local pc and Computer A (188.8.131.52) was connected after password to login into 184.108.40.206.
Then to input the command on my local pc console:
ftp localhost:2121 ftp: localhost:2121: Name or service not known
What is the matter with my ssh tunnel?